diff --git a/homeassistant/components/fully_kiosk/entity.py b/homeassistant/components/fully_kiosk/entity.py
index 87c441dd545..5fd9f75a6a0 100644
--- a/homeassistant/components/fully_kiosk/entity.py
+++ b/homeassistant/components/fully_kiosk/entity.py
@@ -1,9 +1,13 @@
 """Base entity for the Fully Kiosk Browser integration."""
 from __future__ import annotations
 
+import json
+
 from yarl import URL
 
+from homeassistant.components import mqtt
 from homeassistant.const import ATTR_CONNECTIONS
+from homeassistant.core import CALLBACK_TYPE, callback
 from homeassistant.helpers.device_registry import CONNECTION_NETWORK_MAC, DeviceInfo
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
@@ -54,3 +58,28 @@ class FullyKioskEntity(CoordinatorEntity[FullyKioskDataUpdateCoordinator], Entit
                 (CONNECTION_NETWORK_MAC, coordinator.data["Mac"])
             }
         self._attr_device_info = device_info
+
+    async def mqtt_subscribe(
+        self, event: str | None, event_callback: CALLBACK_TYPE
+    ) -> CALLBACK_TYPE | None:
+        """Subscribe to MQTT for a given event."""
+        data = self.coordinator.data
+        if (
+            event is None
+            or not mqtt.mqtt_config_entry_enabled(self.hass)
+            or not data["settings"]["mqttEnabled"]
+        ):
+            return None
+
+        @callback
+        def message_callback(message: mqtt.ReceiveMessage) -> None:
+            payload = json.loads(message.payload)
+            event_callback(**payload)
+
+        topic_template = data["settings"]["mqttEventTopic"]
+        topic = (
+            topic_template.replace("$appId", "fully")
+            .replace("$event", event)
+            .replace("$deviceId", data["deviceID"])
+        )
+        return await mqtt.async_subscribe(self.hass, topic, message_callback)
diff --git a/homeassistant/components/fully_kiosk/manifest.json b/homeassistant/components/fully_kiosk/manifest.json
index dcd36671fce..b5dadf14184 100644
--- a/homeassistant/components/fully_kiosk/manifest.json
+++ b/homeassistant/components/fully_kiosk/manifest.json
@@ -1,6 +1,7 @@
 {
   "domain": "fully_kiosk",
   "name": "Fully Kiosk Browser",
+  "after_dependencies": ["mqtt"],
   "codeowners": ["@cgarwood"],
   "config_flow": true,
   "dhcp": [
diff --git a/homeassistant/components/fully_kiosk/switch.py b/homeassistant/components/fully_kiosk/switch.py
index 500e154abd8..c1d5d4e5c75 100644
--- a/homeassistant/components/fully_kiosk/switch.py
+++ b/homeassistant/components/fully_kiosk/switch.py
@@ -10,7 +10,7 @@ from fullykiosk import FullyKiosk
 from homeassistant.components.switch import SwitchEntity, SwitchEntityDescription
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import EntityCategory
-from homeassistant.core import HomeAssistant
+from homeassistant.core import CALLBACK_TYPE, HomeAssistant, callback
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import DOMAIN
@@ -25,6 +25,8 @@ class FullySwitchEntityDescriptionMixin:
     on_action: Callable[[FullyKiosk], Any]
     off_action: Callable[[FullyKiosk], Any]
     is_on_fn: Callable[[dict[str, Any]], Any]
+    mqtt_on_event: str | None
+    mqtt_off_event: str | None
 
 
 @dataclass
@@ -41,6 +43,8 @@ SWITCHES: tuple[FullySwitchEntityDescription, ...] = (
         on_action=lambda fully: fully.startScreensaver(),
         off_action=lambda fully: fully.stopScreensaver(),
         is_on_fn=lambda data: data.get("isInScreensaver"),
+        mqtt_on_event="onScreensaverStart",
+        mqtt_off_event="onScreensaverStop",
     ),
     FullySwitchEntityDescription(
         key="maintenance",
@@ -49,6 +53,8 @@ SWITCHES: tuple[FullySwitchEntityDescription, ...] = (
         on_action=lambda fully: fully.enableLockedMode(),
         off_action=lambda fully: fully.disableLockedMode(),
         is_on_fn=lambda data: data.get("maintenanceMode"),
+        mqtt_on_event=None,
+        mqtt_off_event=None,
     ),
     FullySwitchEntityDescription(
         key="kiosk",
@@ -57,6 +63,8 @@ SWITCHES: tuple[FullySwitchEntityDescription, ...] = (
         on_action=lambda fully: fully.lockKiosk(),
         off_action=lambda fully: fully.unlockKiosk(),
         is_on_fn=lambda data: data.get("kioskLocked"),
+        mqtt_on_event=None,
+        mqtt_off_event=None,
     ),
     FullySwitchEntityDescription(
         key="motion-detection",
@@ -65,6 +73,8 @@ SWITCHES: tuple[FullySwitchEntityDescription, ...] = (
         on_action=lambda fully: fully.enableMotionDetection(),
         off_action=lambda fully: fully.disableMotionDetection(),
         is_on_fn=lambda data: data["settings"].get("motionDetection"),
+        mqtt_on_event=None,
+        mqtt_off_event=None,
     ),
     FullySwitchEntityDescription(
         key="screenOn",
@@ -72,6 +82,8 @@ SWITCHES: tuple[FullySwitchEntityDescription, ...] = (
         on_action=lambda fully: fully.screenOn(),
         off_action=lambda fully: fully.screenOff(),
         is_on_fn=lambda data: data.get("screenOn"),
+        mqtt_on_event="screenOn",
+        mqtt_off_event="screenOff",
     ),
 )
 
@@ -105,13 +117,27 @@ class FullySwitchEntity(FullyKioskEntity, SwitchEntity):
         super().__init__(coordinator)
         self.entity_description = description
         self._attr_unique_id = f"{coordinator.data['deviceID']}-{description.key}"
+        self._turned_on_subscription: CALLBACK_TYPE | None = None
+        self._turned_off_subscription: CALLBACK_TYPE | None = None
 
-    @property
-    def is_on(self) -> bool | None:
-        """Return true if the entity is on."""
-        if (is_on := self.entity_description.is_on_fn(self.coordinator.data)) is None:
-            return None
-        return bool(is_on)
+    async def async_added_to_hass(self) -> None:
+        """When entity is added to hass."""
+        await super().async_added_to_hass()
+        description = self.entity_description
+        self._turned_on_subscription = await self.mqtt_subscribe(
+            description.mqtt_off_event, self._turn_off
+        )
+        self._turned_off_subscription = await self.mqtt_subscribe(
+            description.mqtt_on_event, self._turn_on
+        )
+
+    async def async_will_remove_from_hass(self) -> None:
+        """Close MQTT subscriptions when removed."""
+        await super().async_will_remove_from_hass()
+        if self._turned_off_subscription is not None:
+            self._turned_off_subscription()
+        if self._turned_on_subscription is not None:
+            self._turned_on_subscription()
 
     async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn the entity on."""
@@ -122,3 +148,19 @@ class FullySwitchEntity(FullyKioskEntity, SwitchEntity):
         """Turn the entity off."""
         await self.entity_description.off_action(self.coordinator.fully)
         await self.coordinator.async_refresh()
+
+    def _turn_off(self, **kwargs: Any) -> None:
+        """Optimistically turn off."""
+        self._attr_is_on = False
+        self.async_write_ha_state()
+
+    def _turn_on(self, **kwargs: Any) -> None:
+        """Optimistically turn on."""
+        self._attr_is_on = True
+        self.async_write_ha_state()
+
+    @callback
+    def _handle_coordinator_update(self) -> None:
+        """Handle updated data from the coordinator."""
+        self._attr_is_on = bool(self.entity_description.is_on_fn(self.coordinator.data))
+        self.async_write_ha_state()
diff --git a/tests/components/fully_kiosk/test_switch.py b/tests/components/fully_kiosk/test_switch.py
index 4cbdad8d63a..20b5ed11998 100644
--- a/tests/components/fully_kiosk/test_switch.py
+++ b/tests/components/fully_kiosk/test_switch.py
@@ -7,7 +7,8 @@ from homeassistant.const import ATTR_ENTITY_ID
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import device_registry as dr, entity_registry as er
 
-from tests.common import MockConfigEntry
+from tests.common import MockConfigEntry, async_fire_mqtt_message
+from tests.typing import MqttMockHAClient
 
 
 async def test_switches(
@@ -86,6 +87,51 @@ async def test_switches(
     assert device_entry.sw_version == "1.42.5"
 
 
+async def test_switches_mqtt_update(
+    hass: HomeAssistant,
+    mock_fully_kiosk: MagicMock,
+    mqtt_mock: MqttMockHAClient,
+    init_integration: MockConfigEntry,
+) -> None:
+    """Test push updates over MQTT."""
+    assert has_subscribed(mqtt_mock, "fully/event/onScreensaverStart/abcdef-123456")
+    assert has_subscribed(mqtt_mock, "fully/event/onScreensaverStop/abcdef-123456")
+    assert has_subscribed(mqtt_mock, "fully/event/screenOff/abcdef-123456")
+    assert has_subscribed(mqtt_mock, "fully/event/screenOn/abcdef-123456")
+
+    entity = hass.states.get("switch.amazon_fire_screensaver")
+    assert entity
+    assert entity.state == "off"
+
+    entity = hass.states.get("switch.amazon_fire_screen")
+    assert entity
+    assert entity.state == "on"
+
+    async_fire_mqtt_message(hass, "fully/event/onScreensaverStart/abcdef-123456", "{}")
+    entity = hass.states.get("switch.amazon_fire_screensaver")
+    assert entity.state == "on"
+
+    async_fire_mqtt_message(hass, "fully/event/onScreensaverStop/abcdef-123456", "{}")
+    entity = hass.states.get("switch.amazon_fire_screensaver")
+    assert entity.state == "off"
+
+    async_fire_mqtt_message(hass, "fully/event/screenOff/abcdef-123456", "{}")
+    entity = hass.states.get("switch.amazon_fire_screen")
+    assert entity.state == "off"
+
+    async_fire_mqtt_message(hass, "fully/event/screenOn/abcdef-123456", "{}")
+    entity = hass.states.get("switch.amazon_fire_screen")
+    assert entity.state == "on"
+
+
+def has_subscribed(mqtt_mock: MqttMockHAClient, topic: str) -> bool:
+    """Check if MQTT topic has subscription."""
+    for call in mqtt_mock.async_subscribe.call_args_list:
+        if call.args[0] == topic:
+            return True
+    return False
+
+
 def call_service(hass, service, entity_id):
     """Call any service on entity."""
     return hass.services.async_call(